Lead Placement

     Electrocardiographic electrodes, or leads, are used to record electrical potential at the surfaces of the body.  Different arrangements of the leads produce corresponding patterns with the ECG.  For more information about other leads used, consult Dukes' Physiology of Domestic Animals and Ettinger's Small Animal Internal Medicine.  Although there are up to 12 leads that are used in electrocardiology for vector analysis, we will focus on the two most frequently used to monitor veterinary patients under anesthesia:

    Three electrodes are used:  right arm (usually white), left arm (usually black), and left leg (usually red).

Lead II - RA is negative with respect to LL; LA is indifferent.

Base-Apex - (dial lead I) RA is negative with respect to LA; LL is indifferent.

Other Species:

 

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